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simulator b244530ee2a6247b5f930830eeca9dd950da0e7e; default config, 2000 steps; serial paired runs in 50-seed chunks. All supplied hashes verified before execution. Spread from first on_step competitor quotes. Statistics use unrounded edges; per_seed differences rounded to 6 decimals. Timings cover engine.run including a read-only first-state observer. No tuning or strategy changes."}